GH stimulation tests help to diagnose hypopituitarism. For a stimulation test, a sample of blood is drawn after you have fasted for 10-12 hours. Then, under close medical supervision, you are given an intravenous solution of insulin or arginine. Blood samples are then drawn at timed intervals, and GH levels are tested in each to see if your pituitary gland was stimulated by the insulin (or arginine) to produce expected levels of GH.
When is it ordered? GH stimulation testing is ordered when your child has symptoms of GHD, such as when:
- his growth rate slows down in early childhood and he is significantly shorter than others his age;
- TSH tests show that your child is not hypothyroid (low thyroid levels can also cause slowed growth);
- X-rays show delayed bone development;
- your doctor suspects that your child’s pituitary gland is under-active.
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